Improvement in combined furnace or oven and tempering-dies



dinard, Statie @geen eine.

HENRY DISSTN, OF PHILADELPHIA, PENNSYLVANIA;

Letters Patent No. 107,509, dated September 20, 1870.

IMPROVEMENT IN vCOMBINED FURNACE OR OVEN AND TEMPERING-DIES.

Theschedule referred to in these Letters Patent and making part of the same.'

I, umm DISSTON, Ofrhiladeiphia., county ofrnila delphla, State of Pennsylvania, have invented a Oombined Furnace or Oven and Tempering-Dies, of which -thefollowing is a specication.

Nature and Oly'ect .of the Invention.

My invention relates to a furnace and dies for con-v ducting the process of simultaneously straightening und tempering thin articles of steel, for which'Letters Patent of the United States, No. 9,237, were granted `to John' Silvester, August 31, 1852, and of England July 17, 1850; and My invention consists in constructing and arrang- 1ng the dies, as fully described hereafter, so as to maintain thesame at a constant uniform temperature.

The main object' of my invention, which i's fullyV described hereaftenhas been to conduetthe aforesaid process of J ohn Silvester with facility, regularity, and

eiiicieucy,

and without removing the dies from the furnace.

General Description.

A and A. are two heavy cast-iron dies, the under face ofthe upper die and the upper face ofthe lower die being made perfectly true.

The lower die has on its nnder sidc au annular concave channel adapted to spheres a, which are arranged to traverse in a similar channel in a plate, B, resting on walls C C, which form part of .the furnace, and which surround the hre-place D, the latter being situated immediately beneath the lower die.

Another fireplace E communicates with the chamber F, containing the dies, and is somewhat larger than the latter, as shown in figs. 1 and 4, there being suitable openings in the front wall :cof the furnace, through which the tuel is introduced to the iire-places, and also openings communicating with the ash-pits of the same, all these opening being provided with suitable doors, as shown in iig. 3. The chamber F,eontaining the dies, communicates with the chimney D, the latter being provided -with suitable dampers, by which the draught may be regnlated.

per die. 4

Fire having been kindled in the fire-places D and An elongated opeuingLe, provided with -a suitable door, is formed in the front wall of the furnace, for the introduction of the vblades of circular and other saws, andother objects of thin steel, and a corresponding door-way may be formed in the rea-r Vwall of 'the furnace.

In the periphery of I the lower die is -a number of holes, into anyone of which cau be inserted a bar or lever, so that, by the aid of the latter, the dies can be turned 'from time-to time, and the entire periphery of the dies therebye'irposed to the direct heat from the fire-placeE; for it is of importance that the dies should be uniformly heated throughout.

The upper die A is connected by a swivel-Joint,H Y

j, to a rod, H, which passes through thevcoverG of the chamber F, and which is connected to anyy suitable appliances for raising and lowering the'up- E, and dies having been thereby made sufficiently' hot throughout, `care is taken to main-tain them at the desired heatby a proper manipulation ofthe dampers of the chimney, and of the tire-place and ashpit doors.

In hardening fiat pieces of steel-tbe blades of circular saws, for instance-they are always more or less warped, and to straighten them, and at the same time to reduce .the temper of such blades, is the object of' my invention.

Thenpper die A isielevated, anda hardened and warped blade is passed through the opening e onto the lower die, after which the upper vdie is at once lowered.

By the combined heat and pressure to which the blade is thus subjected, it is straightened and tempered simultaneously, as-described in the aforesaid patent of J ohu Silvester.

After the blade has been reduced to the desired temperature, the upper die is raised and the blade withdrawn, prior to the introduction ofanotherblade.

In the moditication shown in iig. 5, the dies are surrounded by a shield, q, of brick-work or other material, which is contiguous to, but free from contact with the dies.

This shield, in which are suitable openings, for admitting the articles of' steel, may extend over the top of the dies, so as to prevent the direct action ot' the heat on the same, which has a tendency to warp the dies. l

I do not claim, broadly, the arrangement of dies within a furnace; but

I claiml. The combination of a chamber, F, containing a. lower die, A', and upper die A, adjustable vertically, 2L fire-place, D, arranged below the lower die, and a ireplace, E, communicating with the chamber F, allsubstantially as described.

2. The die A', supported ou spheres or rollers abovev :i re-place, substantially as specified.

3. The upper die, suspended by@ swivel-joint to n rod which passes through the top ofthe furnace, and which is connected to any suitable mechanism for raising and lowering the said upper die.

4. The shield q, arranged within the furnace and around the dies, 'as set forth. i In Jcestimony whereof I have signed my name to this specification in the presence of two subscribing wi messes.

HENRY DISS'LON.y

YVitncsses:

H. Howsox, A. H. SHOEMAKER. 

